.pc files for input drivers

[Peter Hutterer]

Just to get a general opinion: with each driver having their own properties,
it's a good idea to let the driver install a .h file listing all property
names. see synaptics-properties.h, evdev-properties.h and probably more to
come.

Anyone opposed to a follow-up patch to install the <drivername>.pc file?
If not, xorg-<drivername>.pc or just<drivername>.pc?

Cheers,
  Peter